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Fair Value Remeasurement Based on Significant Inputs Not Observable (Parenthetical) (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of liabilities settlements [1] $ 1.2  
Cash    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of liabilities settlements   $ 0.9
Common Stock    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of liabilities settlements $ 0.2 0.6
Cash and Cash Equivalents    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of liabilities settlements   $ 1.5
[1] Such acquisition liabilities were settled in common stock and cash.